Corresponding Author

Hayman K. Awla

Authors ORCID


Document Type

Research Article


The rice blast infection triggered by Pyricularia oryzae Cav. is a grave issue restraining rice yields globally. Biological regulation has been seen as an encouraging option to such chemical fungicides. The biological control proficiency of 24 isolates of Streptomyces against P. oryzae (KT693184.1) has been examined. Analysis of defense enzymes such as polyphenol, peroxidase (PO), and total protein and phenol content was performed. The Streptomyces isolate that was determined to have maximum effectiveness was determined to be Streptomyces xantholiticus. The sequence was sent to the NCBI vide accession number MW029942. The S. xantholiticus isolate inhibited P. oryzae 92% using dual culture tests. The greenhouse experiments showed that the disease gravity in rice plants with S. xantholiticus isolate was considerably lower compared to plants sans the treatment. The S. xantholiticus isolate was analyzed for its effects concerning the activity of polyphenol and Po enzymes as well as the total protein content present in rice leaves under greenhouse conditions in both presence and absence of P. oryzae. It was found that rice species treated with the S. xantholiticus isolate had enhanced resistance to the rice blast pathogen along with increasing activity levels of the polyphenol and PO enzymes. There was a direct impact on pathogen growth along with the defense response triggered in the plants as a result of the treatment.


Pyricularia oryzae, Peroxidase enzyme, Polyphenol oxidase, Plant growth, Biological control

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